Jets, Superluminal Motion, and Gamma-Ray Bursts
Radio synthesis maps have shown jets in hundreds of AGN, on scales from subparsec to megaparsecs.
superluminal motion
motion that appears to be faster than the speed of light
supermassive black hole ...
Superluminal Motion - The apparent separation of components of a quasar at speeds faster than the speed of light ...
Superluminal motion of astronomical objects
So-called superluminal motion is seen in certain astronomical objects,[100] such as the jets of radio galaxies and quasars.
Continued VLBI monitoring of moving radio components in QSR nuclei, however, revealed many more cases of superluminal motion, not only in compact but also in large double-lobed QSRs.
Several alternative solutions have been proposed to account for the apparent superluminal motion of the blobs without requiring the quasars to be local or the speeds to be truly faster than light.
The key observation that led to the adoption of unified models for powerful radio galaxies and radio-loud quasars was that all quasars appear to be beamed towards us, showing superluminal motion in the cores (Barthel 1989) and bright jets on the ...
This phenomenon, called superluminal motion, is not real, but rather is an illusion caused by the fact that the material in the jet is moving at nearly the speed of light almost directly toward the observer.
The special jet orientation explains the general peculiar characteristics: high observed luminosity, very rapid variation, high polarization (when compared with non-blazar quasars), and the apparent superluminal motions detected along the first few ...
 See also: Galaxies, Galaxy, Distance, Model, Ray
  
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